Answer:

1 Technetium 43 protons, 55 neutrons and 43 electrons

2 Lead 82 protons, 125 neutrons and 82 electrons

3 Tl 81 protons, 123 neutrons and 81 electrons

4 Hydrogen 1 atomic mass 1 proton, 0 neutron and 1 electron

5 Carbon C 6 protons, 6 neutrons and 6 electrons

6 Nitrogen 14 atomic mass, 7 protons, 7 neutrons and 7 electrons

7 Barium 137 atomic mass 56 protons, 81 neutrons and 56 electrons

8 Ca 40 atomic mass, 20 protons, 20 neutrons and 20 electrons

9 Silicon 28 atomic mass, 14 protons, 14 neutrons and 14 electrons

10 Ar 40 atomic mass, 18 protons, 22 neutrons and 18 electrons

Explanation: